Diann wrote:

I have an oak seedling from an acorn from this spring. It is in a pot
can I plant it this fall? When? I am in northeast Indiana. Thanks!

See my http://www.rossde.com/garden/garden_oak_acorn.html. You
should keep it in a container for about 2-3 years. Move it to a
larger container in the spring, just as the leaf buds start to
swell.

Since you live in an climate with rainy summers, you don't have to
prune the taproot. Your native oaks are already adapted to summer
watering. However, don't let the seedling become potbound with a
taproot that winds around and around. Keep moving it up to larger
containers.

You can set it into the ground when the trunk is about the
thickness of your index finger. By then, it is no longer a
seedling. It's a sapling.

--
David E. Ross
Climate: California Mediterranean
Sunset Zone: 21 -- interior Santa Monica Mountains with some ocean
influence (USDA 10a, very close to Sunset Zone 19)
Gardening pages at http://www.rossde.com/garden/